Summary

by John Marshall Harlan New York Company v. People of the State of New York…

We know from the face of the statute that it has a real, substantial relation to an object as to which the state is competent to legislate, namely, the personal security of those who are passengers on cars used within its limits. Why may not regulations to that end be made applicable, within a state, to the cars of railroad companies engaged in interstate commerce as well as to cars used wholly within such state? Persons traveling on interstate trains are as much entitled, while within a state, to the protection of that state, as those who travel on domestic trains.
Source: Wikisource

by John Marshall Harlan New York Company v. People of the State of New York…

In any event, there is no such discrimination against companies having more than 50 miles of road as to justify the contention that there has been a denial to the companies named in the act of the equal protection of the laws. The statute is uniform in its operation upon all railroad companies doing business in the state of the class to which it is made applicable.
Source: Wikisource

by John Marshall Harlan New York Company v. People of the State of New York…

Until displaced by such national legislation as congress may rightfully establish under its power to regulate commerce with foreign nations and among the several states, the validity of the statute, so far as the commerce clause of the constitution of the United States is concerned, cannot be questioned.
Counsel for the railroad suggests that a conflict between state regulations in respect of the heating of passenger cars used in interstate commerce would make safe and rapid transportation impossible
Source: Wikisource

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